/Engine/Source/Runtime/RenderCore/Public/RenderGraphBuilder.h
Queues a pooled buffer extraction to happen at the end of graph execution. For graph-created buffers, this extends the lifetime of the GPU resource until execution, at which point the pointer is filled. If specified, the buffer is transitioned to the AccessFinal state, or kDefaultAccessFinal otherwise.
void QueueBufferExtraction ( FRDGBufferRef Buffer, [TRefCountPtr](API\Runtime\Core\Templates\TRefCountPtr)< [FRDGPooledBuffer](API\Runtime\RenderCore\FRDGPooledBuffer) > * OutPooledBufferPtr, ERHIAccess AccessFinal )